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基于SYSWELD软件对Q345D结构钢TIG焊的T型接头的应力场和焊接组织进行数值模拟。应力场模拟结果如下:焊缝处应力为拉应力,热影响区应力为压应力,翼板两侧处应力为拉应力。对热影响区进行相组织模拟,发现焊缝处存在大量马氏体相等组织,并通过实验验证了数值模拟结果的正确性。结果表明,Q345D结构钢TIG焊时,热影响区残余应力为压应力,其原因是热影响区发生了马氏体相变,且马氏体转变造成的体积膨胀而引起的压应力大于冷却收缩所引起的拉应力。
Based on SYSWELD software, the stress field and the welded structure of the T-joint of Q345D structural steel TIG welding were simulated. The stress field simulation results are as follows: The stress at the weld joint is tensile stress, the stress at the HAZ is the compressive stress, and the stress at both sides of the wing is the tensile stress. The heat-affected zone was simulated by phase structure. It was found that there was a large amount of martensite equivalent structure in the weld, and the correctness of the numerical simulation results were verified by experiments. The results show that the residual stress in the heat affected zone is compressive stress in Q345D structural steel TIG welding. The reason for this is that the martensite transformation occurs in the heat affected zone and the compressive stress caused by the volume expansion caused by the martensitic transformation is larger than the cooling shrinkage The resulting tensile stress.